KR20070026307A - Incombustible withdrawing system from a fluidized-bed furnace - Google Patents

Abstract

An incombustible withdrawing system (302a) withdraws an incombustible from a fluidized-bed furnace (305) having a fluidized bed (312) formed therein by a fluidized medium (310). The incombustible withdrawing system (302a) has a mixture delivery path (316) to deliver a mixture (310b) of the fluidized medium and the incombustible from a bottom (311) of the fluidized-bed furnace (305). The incombustible withdrawing system (302a) also has a fluidized-bed separating chamber (390) disposed downstream of the mixture delivery path (316) to fluidize the mixture (310b) by a fluidizing gas (331) and to separate the mixture into a first separated mixture (310g) and a second separated mixture (310f). The incombustible withdrawing system (302a) includes a return passage (391, 394) to return the first separated mixture (310g) to the fluidized-bed furnace (305), and an incombustible discharge passage (392) to discharge the second separated mixture (310f) to an exterior of the fluidized-bed furnace (305). ® KIPO & WIPO 2007

Description

INCOMBUSTIBLE WITHDRAWING SYSTEM FROM A FLUIDIZED-BED FURNACE}

FIELD OF THE INVENTION The present invention relates to a nonflammable material eviction system for retiring nonflammable material from a fluidized bed furnace, such as a fluidized bed combustor, fluidized bed vaporizer, or a circulating fluidized bed boiler. Burning, vaporizing or pyrolyzing solid combustible materials such as waste fuels such as waste FRP, biomass waste, waste vehicle residue (ASR) and waste oil or solid fuels containing incombustibles (eg coal) The present invention relates to a non-combustible material eviction system for retiring non-combustible materials together with a fluidized medium discharged from a fluidized bed furnace. The present invention also relates to a fluidized bed furnace system having such a non-combustible material removal system and a fluidized bed furnace.

1 is a schematic cross-sectional view of a conventional fluidized bed vaporization system (fluidized bed system) 501 having a non-combustible material eviction system 502 and a fluidized bed vaporization furnace (fluidized bed furnace) 505. The non-combustible material eviction system 502 includes a non-combustible material evident chute 504, a non-combustible material eviction conveyor 520, and a double damper 518. Solid combustible materials 514 are fed into the fluidized-bed gasification furnace 505 and partially combusted or vaporized in the fluidized-bed gasification furnace 505. Incombustibles are circulated with the fluidized medium 510 in the fluidized bed 512. The incombustible material chute chute 504 has a vertical or inclined surface in which the mixture 510a of the incombustibles and fluid medium 510 flows naturally from the bottom 511 to the fluidized bed. The mixture 510a is formed from the incombustibles material chute 504 via the incombustibles material chute 520 via the incombustibles material chute conveyor 520 connected to the lower end of the incombustibles material chute 504. It is delivered into a double damper 518 disposed downstream.

In the fluidized-bed gasification furnace 505, air 524 for partial combustion is supplied into the fluidized bed 512 from the bottom 511 of the fluidized bed so that the fluidized medium 510 is fluidized at 350 ° C. to 850 ° C. It forms a circulating fluidized bed 512. When a solid combustible material 514 is fed into the fluidized bed 512 of the fluidized-bed gasification furnace 505, the solid combustible materials 514 are heated with the fluidized medium 510 and air 524 for partial combustion. Upon contacting, it is directly pyrolyzed and vaporized to produce gas, tar and solid carbon.

The pyrolyzed gas generated in the fluidized bed 512 is discharged from the discharge duct 522 provided above the fluidized bed 512. The fluid medium 510 and the mixture 510a of incombustibles are discharged from the bottom 511 to the fluidized bed through the incombustibles evident chute 504. The discharged fluid medium 510 contains incombustible materials such as silica sand, iron, steel, and aluminum, and unburned char generated in the vaporization process.

In the conventional fluidized-bed gasification furnace system 501 described above, airtightness can be maintained in the mixture delivery path 516 extending from the incombustibles material chute 504 to the incombustibles material exit conveyor 520. It is important to maintain sealing performance. In particular, if the sealing performance is not maintained in the airtight portion of the mixture delivery furnace 516, unburned combustible gas, carbon monoxide, etc. in the fluidized bed vaporization furnace 505 leak out of the fluidized bed vaporization furnace 505 and explode. Or cause poisoning to the human body. If air 524 for partial combustion leaks into the incombustibles chute 504, the unburned combustibles contained in the fluid medium 510 are burned in the incombustibles chute 504, Increasing the temperature of the incombustible material chute 504. Accordingly, silica sand and ash may be melted to produce clinkers. The double damper 218 disposed at the outlet of the incombustible material evacuation conveyor 520 serves to compensate for the sealing performance described above.

The unburned char mixed in the fluid medium 510 to be discharged, even if airtight is maintained in the mixture delivery path 516 extending from the incombustibles material chute 504 to the incombustibles material exit conveyor 520. Reacts with scattered air 524 for partial combustion in a portion above the incombustibles chute 504, that is, in a portion 515 near the inlet of the incombustibles chute 504. Thus, unburned char may be burned to produce a clinker to increase the temperature of the portion 515. Such clinker interferes with the incombustible material chute chute 504, thereby lowering the solubility of the fluidized bed vaporization furnace 505.

The present invention has been devised in view of the above disadvantages. Therefore, a first object of the present invention is to provide a fluidized bed furnace system having a nonflammable material retrieval system capable of withdrawing a nonflammable material out of the fluidized bed furnace system with an increase in the concentration of nonflammable material in the mixture of the fluidized medium and the nonflammable material. It is.

It is a second object of the present invention to provide a non-combustible material eviction system that can prevent unburned gas from leaking out of the system into the fluidized bed.

According to a first embodiment of the present invention, there is provided a non-combustible material eviction system for discharging a non-combustible material from a fluidized bed in which a fluidized bed is formed therein by the fluidized medium. The incombustible material removal system includes a mixture delivery path for delivering a mixture of the incombustible material and the fluid medium from the bottom of the fluidized bed. The incombustible material removal system also fluidizes the mixture by a fluidizing gas and separates the mixture into a separate first mixture having a high concentration of fluid medium and a second mixture having a high concentration of incombustible material. And a fluidized bed separation chamber disposed downstream of the delivery passage. The non-combustible material eviction system includes a conveyance passage for conveying the separated first mixture to the fluidized bed furnace and a non-combustible substance discharge passage for discharging the separated second mixture to the outside of the fluidized bed.

Thus, the incombustible material removal system comprises a mixture delivery passage, a fluidized bed separation chamber, a conveyance passage and a noncombustible material discharge passage. The fluidized medium is delivered from the bottom of the fluidized bed through the mixture delivery path and mixed with the incombustible material. The mixture of fluidized medium and non-combustible material is fluidized by fluidizing gas in the fluidized bed separation chamber to change the concentration distribution of the fluidized medium and non-combustible material in the mixture. Thus, the mixture is separated into a separated first mixture having a high concentration of fluidized medium and a separated second mixture having a high concentration of incombustibles. The separated first mixture may be conveyed to the fluidized bed through the conveying passage. The separated second mixture may be discharged to the outside of the fluidized bed through the incombustible material discharge passage.

According to a preferred embodiment of the invention, the incombustibles discharging passage is arranged downstream of the fluidized bed separation chamber. The incombustibles discharging passage may deliver the separated second mixture upwards in a vertical direction and discharge the separated second mixture out of the fluidized bed from a position located higher than the surface of the fluidized bed. According to this incombustible discharge passage, the separated second mixture can be transferred upward in the vertical direction and discharged to the outside of the fluidized bed from a position located higher than the surface of the fluidized bed.

According to a preferred embodiment of the present invention, the non-combustible material eviction system further includes a fluid medium delivery device for delivering the separated second mixture in the vertical direction in the non-combustible material discharge passage. Alternatively, the non-combustible material eviction system includes a fluidized media delivery device for delivering the separated second mixture in the non-combustible discharge passage at at least an angle of repose with respect to a horizontal plane. It may further include. According to such a fluid medium delivery device, the separated second mixture may be transferred upward in the vertical direction in the incombustibles discharge passage in the vertical direction or at the minimum angle of repose of the fluid medium relative to the horizontal plane.

According to a preferred embodiment of the present invention, the fluidized bed separation chamber comprises a passage portion connected to the incombustible material discharge passage. The passage portion has a cross-sectional area that gradually increases toward the incombustibles discharging passage and a bottom surface that is inclined downward relative to the incombustibles discharging passage. According to this aspect, the mixture can be effectively separated into the separated first mixture and separated second mixture in the passage portion.

According to a second embodiment of the present invention, there is provided a non-combustible material eviction system for discharging a non-combustible material from a fluidized bed furnace in which a fluidized bed is formed therein by the fluidized medium. The incombustible material removal system includes a mixture delivery path for delivering a mixture of the incombustible material and the fluid medium from the bottom of the fluidized bed. The non-combustible material eviction system also provides a non-combustible material disposed downstream of the mixture delivery path to deliver the mixture upwards in a vertical direction and to discharge the mixture out of the fluidized bed from a position located above the surface of the fluidized bed. A discharge passage is provided.

Thus, the non-combustible material removal system has a mixture delivery passage and a non-combustible material discharge passage. The mixture delivered from the bottom of the fluidized bed through the mixture delivery passage is delivered upwards in a vertical direction and may be discharged out of the fluidized bed from a position located above the surface of the fluidized bed by the incombustible material discharge passage.

According to a third embodiment of the present invention, there is provided a non-combustible material eviction system for discharging a non-combustible material from a fluidized bed with a fluidized bed formed therein by a fluidized medium. The non-combustible material removal system includes a mixture delivery path for delivering a mixture of the non-combustible material and the fluid medium from the bottom of the fluidized bed. The non-combustible material evacuation system also includes a non-combustible material discharge passage disposed downstream of the mixture delivery passage and a fluid medium delivery device for delivering the mixture outward to the fluidized bed in a vertical direction upward in the non-combustible material discharge passage. . The non-combustible material eviction system includes a protrusion that projects radially inwardly from an inner surface of the non-combustible material discharge passage. According to this aspect, the mixture is prevented from rotating circumferentially with the rotating screw vanes, so that stable delivery can be achieved.

According to a fourth embodiment of the present invention, there is provided a non-combustible material eviction system for discharging a non-combustible material from a fluidized bed furnace in which a fluidized bed is formed therein by the fluidized medium. The incombustible material removal system includes a mixture delivery path for delivering a mixture of the incombustible material and the fluid medium from the bottom of the fluidized bed. The non-combustible material evacuation system also includes a screw conveyor having screw vanes for conveying the mixture outward to the fluidized bed vertically upwardly from the non-combustible material discharge passage disposed downstream of the mixture delivery passage. It is provided. The screw conveyor is provided with a blocking member provided on the rear surface of the screw vane.

According to a fifth embodiment of the present invention, there is provided a non-combustible material eviction system for discharging a non-combustible material from a fluidized bed furnace having a fluidized bed formed therein by a fluidized medium. The incombustible material removal system includes a mixture delivery path for delivering a mixture of the incombustible material and the fluid medium from the bottom of the fluidized bed. The non-combustible material evacuation system also includes a non-combustible material discharge passage disposed downstream of the mixture delivery passage and a fluid medium delivery device for delivering the mixture outward to the fluidized bed in a vertical direction upward in the non-combustible material discharge passage. . The non-combustible material eviction system includes a blower that blows gas into the lower portion of the flow medium delivery device to increase pressure in the lower portion of the flow medium delivery device.

According to a sixth embodiment of the present invention, there is provided a fluidized bed furnace system having a fluidized bed furnace formed therein by a fluidized medium for combusting, vaporizing, or pyrolyzing an object containing an incombustible material. The fluidized bed furnace system is provided with a non-combustible material removal system described above. According to this aspect, the separated first mixture may be returned to the fluidized bed furnace, and the separated second mixture may be discharged to the outside of the fluidized bed furnace.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate preferred embodiments of the invention in an illustrative manner.

1 is a schematic cross-sectional view of a conventional fluidized-bed gasification furnace system.

2 is a schematic view showing a non-combustible material eviction system in a vaporization system according to a first embodiment of the present invention.

3 is a schematic view showing a non-combustible material eviction system in a vaporization system according to a second embodiment of the present invention.

4 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized bed furnace system according to a third embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized bed furnace system according to a fourth embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized-bed gasification and slagging combustion system according to a fifth embodiment of the present invention.

7 is a schematic diagram illustrating a system for evacuating a non-combustible material in a fluidized-bed gasification furnace system according to a sixth embodiment of the present invention.

8 is a schematic view showing a non-combustible material eviction system in a fluidized-bed gasification furnace system according to a seventh embodiment of the present invention.

9 is a schematic diagram illustrating a system for evacuating a non-combustible material in a fluidized bed furnace system according to an eighth embodiment of the present invention.

10 is a schematic view showing a non-combustible substance eviction system in a vaporization system according to a ninth embodiment of the present invention.

11 is a schematic cross-sectional view showing a screw conveyor of a non-combustible material eviction system according to a tenth embodiment of the present invention.

12 is a front view showing a screw conveyor of the incombustible material eviction system according to the eleventh embodiment of the present invention.

FIG. 13 is a front view illustrating a screw conveyor of a non-combustible material eviction system according to a twelfth embodiment of the present invention.

Hereinafter, a non-combustible material eviction system according to embodiments of the present invention will be described with reference to FIGS.

2 is a schematic diagram showing a non-combustible material eviction system in the vaporization system (fluid bed system) 301 according to the first embodiment of the present invention. The fluidized bed furnace system 301 includes a fluidized bed furnace 305 for retaining a fluid medium 310 therein and a non-combustible material eviction system 302a. The fluidized bed passage 305 comprises a cylindrical or rectangular receptacle provided in a vertical direction on the ground. The incombustible material eviction system 302a includes a mixture delivery path 316 provided below the fluidized bed passage 305, a fluidized bed separation chamber 390 located downstream of the mixture delivery path 316, and the fluidized bed separation chamber 390. ) A fluid medium raising chamber 391 provided as an upper conveying passage, a rising chamber 392 provided as a nonflammable discharge passage downstream of the fluidized bed separation chamber 390 and a downstream of the fluid medium raising chamber 391. And a liquid medium conveyance passage 394 provided. The mixture delivery passage 316 has a non-combustible material shed chute 307 and a horizontal mixture delivery passage 316d. The non-combustible material chute chute 307 is connected to the bottom 311 of the fluidized bed 305 is disposed in the vertical direction. The horizontal mixture delivery passage 316d is connected to the incombustible material chute chute 307 and is disposed in a horizontal direction.

Combustible wastes 314 are introduced into the fluidized bed furnace 305 through a feed port 308 provided in the upper wall of the fluidized bed furnace 305. The hot fluid medium 310 having a combustion temperature for combusting the combustible wastes 314 is fluidized by the combustion air 324 blown from the bottom 311 of the fluidized bed to circulate the fluid 306. ). Thus, a dense circulating fluidized bed 312 is formed in the fluidized bed furnace 305. The combustible wastes 314 are combusted in the circulating fluidized bed 312. For example, the combustible wastes 314 are wastes such as municipal waste, solid fuel (RDF) using solid waste, waste plastic, waste fiber reinforced plastic (waste FRP), biomass waste, waste vehicle residue (ASR) and waste oil. Or combustible materials such as solid fuels (eg coal) containing non-combustible materials.

Combustible waste 314 supplied into the fluidized bed furnace 305 is completely combusted in the fluidized bed furnace 305. Completely combustible combustible wastes 314 form the mixture 310a of the fluidized medium 310 and non-combustible materials. The mixture 310a is withdrawn from the bottom 311 of the fluidized bed 305 through the mixture delivery path 316 into the fluidized bed separation chamber 390. The gas produced by the complete combustion of the combustible wastes 314 is discharged through an exhaust duct 322 provided at the top of the fluidized bed furnace 305, for example fed to a subsequent slagging furnace system.

The mixture 310a flows down from the bottom 311 of the fluidized bed furnace 305 to the horizontal mixture delivery path 316d of the mixture delivery path 316. Thereafter, the mixture 310b in the horizontal mixture delivery passage 316d passes the mixture delivery passage 316 in a hermetic manner by a screw conveyor (not shown) disposed in the horizontal mixture delivery passage 316d. It is delivered to the separation chamber 390 through the fluidized bed.

The mixture 310b supplied into the fluidized bed separation chamber 390 is a fluidized medium 310 having a high concentration by the fluidization gas 331 (eg, an inert gas containing no oxygen) supplied through the supply port 330. Is separated into a separated first mixture (310g) having a) and a separated second mixture (310f) having a high concentration of incombustible materials. The first mixture 310g rises together with the fluidizing gas 331 through the fluid medium raising chamber 391, and from the fluid medium outlet 393 through the fluid medium conveying passage 394, the fluidized bed passage 305. Is transferred to the return port 393a. Thus, the first mixture 310g is supplied to a freeboard of the fluidized bed furnace 305. The fluidizing gas 331 to be supplied into the fluidized bed separation chamber 390 may comprise a gas containing oxygen, such as air, if the first mixture 310g has a sufficiently low concentration of unburned combustible materials.

In addition, the gas is discharged from the fluid medium raising chamber 391 through the fluidization gas outlet 397 provided at the top of the fluid medium raising chamber 391, and the gas return hole 396 of the fluidized bed passage 305 is provided. From the feed to the freeboard 322 of the fluidized bed furnace 305. The gas from the fluid medium raising chamber 391 is effectively utilized as secondary combustion gas in the fluidized bed 305. The outlet 397 and the fluid medium outlet 393 may be integrated with each other. In this case, the gas conveyance port 396 and the conveyance port 393a may also be integrated with each other.

Thus, the fluid medium raising chamber 391 is in communication with the freeboard 332 of the fluidized bed passage 305. Therefore, an extremely large pressure difference between the fluidized bed passage 305 and the fluid medium raising chamber 391 can be prevented from occurring.

The second mixture 310f flows into the rising chamber 392 as an incombustible material discharge passage disposed adjacent to the fluidized bed separation chamber 390. The second mixture 310f is moved upwardly in the rising chamber 392 in the rising chamber 392 by a screw conveyor 378 which transmits in a vertical direction as a fluid medium delivery device, and as a non-combustible material 360 as a non-combustible material outlet ( 317 is discharged to the system (not shown) outside or in the subsequent slagging combustion of the rising chamber 392. In the illustrated example, the rising chamber 392 is provided with an angle of 90 ° with respect to the ground in the vertical direction.

As described above, the incombustibles are evicted in an upward direction after being evicted in a downward direction. Thus, the non-combustible material eviction system according to the present invention is different from the conventional non-combustible material eviction system which only evicts the non-combustible materials in the downward direction. Even without a mechanical sealing device such as a double damper, the gas or combustion air 324 in the fluidized bed passage 305 can be easily prevented from leaking into the incombustible material chute 307.

In addition, according to the conventional non-combustible material eviction system, the ratio of the evicted non-combustibles to the second mixture 310f containing the fluid medium 310 is about several percent to about 10 percent. According to the non-combustible material eviction system 302a according to the present invention, the ratio of the evicted non-combustibles to the second mixture 310f containing the fluid medium 310 can be significantly increased from 30% to 50%. . Even if the waste vehicle residue containing more than 20% of the non-combustible material is supplied to the fluidized bed furnace 305, a large amount of the non-combustible material is withdrawn to the outside of the system together with the fluid medium 310, so that the second mixture 310f The proportion of incombustibles contained in) may be increased.

For example, to prevent the formation of clinker, a cooling system (not shown) is added to cool the fluid medium 310a passing through the incombustible material chute 307. In this case, it is possible to prevent the heat recovery rate from being lowered by the heat loss, thereby preventing the difficulties caused by the high temperature fluid medium downstream of the incombustible material evacuation chute 307. Thus, various adverse effects such as an increase in the consumption of auxiliary fuel can be effectively prevented. In addition, a large amount of the fluid medium 310 may be completely cooled to a level such that the fluid medium 310 does not cause any problems downstream of the incombustibles material chute 307.

3 is a schematic diagram showing a non-combustible material eviction system 302a in a vaporization system according to a second embodiment of the present invention. FIG. 3A is a horizontal sectional view, and FIG. 3B is a vertical sectional view. The non-combustible material removal system 302a is conveyed above the mixture delivery passage 316, the mixture outlet 316a, the fluidized bed separation chamber 390 provided downstream of the mixture outlet 316a, and the fluidized bed separation chamber 390. Fluid medium raising chamber 391 provided as a passage and a rising chamber 392 provided as a non-combustible discharge passage downstream of the fluidized bed separation chamber 390.

For example, a mixture 310b of fluid medium 310 having a particle diameter of about several tens of micrometers to several millimeters and non-combustible materials having a small axis of, for example, several millimeters to about 200 mm may be the bottom of the fluidized bed (not shown). Evicted from). The mixture 310b is delivered through the mixture outlet 316a to a subsequent fluidized bed separation chamber 390 by a screw conveyor 320 rotatably supported in the mixture delivery path 316.

The mixture 310b fed into the fluidized bed separation chamber 390 is fluidized as powder particles in the fluidized bed separation chamber 390 to form a fluidized bed. The concentration distribution of incombustibles in the fluidized medium 310 and the mixture 310b is such that the concentration of the fluidized medium 310 is high at the top of the fluidized bed and the concentration of the incombustibles is at the bottom of the fluidized bed. Changed to high. Thus, the mixture 310b is separated into a separated first mixture 310g having a high concentration of fluidized medium and a separated second mixture 310f having a high concentration of incombustibles.

The first mixture 310g having a high concentration of fluid medium 310 is returned to the fluidized bed furnace (not shown) through the fluid medium raising chamber 391. The second mixture 310f having high concentrations of incombustibles is discharged out of the fluidized bed furnace (not shown) through the rising chamber 392.

The fluidized bed separation chamber 390 of the incombustible material eviction system 302a includes a passage portion 390c connected to the rising chamber 392. The passage portion 390c has a bottom surface 390b that is inclined downward with respect to the rising chamber 392. Supply ports 330 and 330a are provided as fluidizing gas dispersion nozzles on the bottom surface 390b of the passage portion 390c so that the supply port 330 is positioned at a position higher than the supply port 330a. Steam, which is a gas that does not contain oxygen, is blown into the fluidized bed separation chamber 390 as the fluidizing gas 331. The fluidizing gas 331 may include carbon dioxide which is a gas containing no oxygen.

Thus, in order to prevent problems that the fluidizing gas 331 flows back into the fluidized bed furnace (not shown) to create a clinker, a gas containing no oxygen is used as the fluidizing gas 331. Therefore, the fluidizing gas 331 supplied into the fluidized bed separation chamber 390 may comprise a gas containing oxygen, such as air, if the fluidized medium has a sufficiently low concentration of unburned combustible materials. .

In order to prevent the fluid medium from being locked in the fluidized bed separation chamber 390, steam as fluidizing gas 331 is introduced by a blower such as a blower (not shown) through vapor ports 330 and 330a. It is fed into a fluidized bed separation chamber 390 to allow the fluidized medium to maintain at least its minimum fluidization rate. In order to more effectively separate the incombustible materials 310c in the fluidized medium 310d and the fluidized bed separation chamber 390, it is preferable to supply the fluidized gas 331 such that the fluidized medium maintains at least a minimum fluidization rate. . The fluidization of the fluidized medium moves the incombustible material 310c toward the bottom surface 390b of the fluidized bed separation chamber 390 and smoothly moves the fluidized medium 310d to the top of the fluidized bed separation chamber 390. As a result, the fluid medium 310d and the incombustible materials 310c are separated.

In particular, the concentration of non-combustibles in the mixture 310b (mixture of fluid medium 310d and non-combustible materials 310c) is such that the passage in the fluidized bed separation chamber 390 to concentrate the non-combustible materials 310c. It becomes relatively high in the vicinity of the bottom surface 390b of 390c. In addition, since the incombustibles 310c come into direct contact with the fluidizing gas 331 blown from the supply ports 330 and 330a, the incombustibles 310c are rapidly cooled. The nonflammable materials 310c fluidized near the bottom surface 390b of the passage portion 390c which comes into contact with the fluidizing gas 331 are cooler than other nonflammable materials in the fluidized bed separation chamber 390. do.

The first mixture 310g containing the fluid medium 310d is collected to an upper portion of the fluidized bed separation chamber 390 and upwardly flows the fluidized gas 331 blown from the supply ports 330 and 330a. And ascend through the fluid medium raising chamber 391 provided above the fluidized bed separation chamber 390. The fluid medium raising chamber 391 has a fluid medium outlet 393 thereon. Thereafter, the first mixture 310g containing the fluid medium 310e is discharged from the fluid medium outlet 393 to the fluidized bed furnace (not shown) through a conveyance port (not shown).

The fluid medium raising chamber 391 has a weir 395 located upstream of the fluid medium outlet 393 so that only the fluid medium ejected above a predetermined height is discharged from the fluid medium outlet 393. To be possible. The weir 395 fills the fluid medium outlet 393 with the first mixture 310g containing the fluid medium 310e, and discharges the fluid medium outlet 393 and the first mixture 310g. It serves to balance the pressures between the fluidized bed furnaces (not shown). The weir 395 is effective in controlling the pressure in the fluid medium raising chamber 391 independently of the pressure in the fluidized bed furnace (not shown).

On the other hand, the non-combustible materials 310c near the bottom surface 390b of the passage portion 390c may include the second mixture 310f containing the non-combustible material 310c and the concentrated fluid medium 310. And into the rising chamber 392 along the bottom surface 390b of the passage portion 390c. As shown in FIG. 3A, the passage portion 390c has a cross-sectional area that gradually increases through the bottom of the rising chamber 392.

In particular, even if the fluidized medium in the mixture 310b with increased concentrations of incombustibles causes bridge troubles, the mixture 310b is smooth from the fluidized bed separation chamber 390 into the rising chamber 392. Can be introduced. In addition, the height difference and the cross-sectional difference in the passage part 390c may effectively prevent the second mixture 310f from flowing back from the rising chamber 392 to the fluidized bed separation chamber 390.

The rising chamber 392 includes a screw conveyor 378 as a fluid transfer device for moving the second mixture 310f upward in the vertical direction. In order to move the second mixture 310f with the rising chamber 392 filled with the second mixture 310f, the fluid delivery device must preferably have a transfer efficiency lower than 100%. .

In particular, if the rising chamber 392 is not completely filled with the second mixture 310f containing the flow medium, the sealing performance against external pressure is reduced. In this case, the fluidizing gas 331 supplied from the supply port 330 into the fluidized bed separation chamber 390 may flow into the rising chamber 392 to prevent separation in the fluidized bed separation chamber 390. You can do it. In addition, this also makes it difficult to maintain the pressure of the fluidized bed separation chamber 390. Accordingly, gas in the fluidized bed furnace (not shown) may flow into the fluidized bed separation chamber 390 and the rising chamber 392, and may eventually leak out of the rising chamber 392. Therefore, it is desirable for the fluid carrier delivery device to have a delivery efficiency of less than 100%.

The rising chamber 392 has a non-combustible material outlet 317 located above the rising chamber 392. The lowest position 317a of the non-combustible material outlet 317 may be arbitrarily set according to the required floor height of the rising chamber 392. For example, the required bed height of the rising chamber 392 is the height of the fixed bed of the fluidized medium capable of achieving the sealing performance required to maintain the pressure in the fluidized bed separation chamber 390 at the required value. The required bed height of the rising chamber 392 is higher than the height of the surface (not shown) of the fluidized bed. The height of the lowest position 317a of the incombustibles outlet 317 is hereinafter referred to as the height of the incombustibles outlet 317.

The required value of the pressure in the fluidized bed separation chamber 390 depends on the device connected upstream of the fluidized bed separation chamber 390. In the case of a fluidized bed furnace system with the fluidized bed furnace (not shown) and the incombustible material retirement system 302a according to the present embodiment, the required value is a non-combustible material retirement part (not shown) located near the bottom of the fluidized bed furnace Higher than the pressure). The height of the incombustibles outlet 317 can be set to any value as long as it is higher than the required floor height of the rising chamber 392.

The height of the non-combustible material outlet 317 is not limited to the above example in connection with the height of the fixed bed of the fluid medium, it may be set higher than the above example. For example, the height of the non-combustible material outlet 317 may be set higher than the position (392a) 1 m in the vertical direction above the floor (390a) of the fluidized bed separation chamber 390, and also of the fixed bed of the fluidized medium It may be set higher than the height.

Thus, the sealing performance to the outside of the rising chamber 392 may be arbitrarily designed by adjusting the height of the non-combustible material outlet 317. Therefore, the height of the fluidized bed in the fluidized bed furnace (not shown) which has been limited so far can be designed more flexibly. Accordingly, the fluidized bed furnace system (not shown) can be made larger and more flexible.

As shown in FIG. 3B, the rising chamber 392 is preferably provided in a vertical direction at an angle of 90 ° with respect to the ground. Alternatively, to maintain transfer efficiency, the rising chamber 392 may be tilted at a larger angle of at least 80 °, preferably at least 70 °, more preferably at least 60 °. As the larger angle becomes smaller, the transfer efficiency of the fluidized medium and the incombustible material may be higher. When the rising chamber 392 is inclined at an enlarged angle of 60 °, the transfer efficiency is in the range of 15 to 20%. If the rising chamber 392 is excessively tilted to be substantially horizontal, its length must be lengthened such that the screw conveyor 378 as a fluid delivery device reaches a predetermined height. Therefore, it is not reasonable for the rising chamber 392 to be inclined excessively.

On the other hand, in order to maintain the separation effects of the fluid medium, the inclination angle of the rising chamber 392 with respect to the horizontal plane is at least the angle of repose (35 °) of the fluid medium, more preferably 60 ° or more, more preferably 70 °. As mentioned above, More preferably, it is an angle of 80 degrees or more.

When the screw conveyor 378 is used as the fluid medium delivery device, the inclination angle of the rising chamber 392 is set closer to 90 ° so that the fluid medium 310 is placed on top of the screw conveyor 378. It is prevented from flowing into the axial seal of the located cantilever support and from causing damage to the axial seal.

When the screw conveyor 378 has a screw shaft along the vertical direction, only an upper portion of the screw shaft is positioned at the top of the rising chamber 392 so that the screw shaft is suspended downward. With this configuration, the axial seal can be omitted from the bottom of the rising chamber 392. Even if thermal expansion is caused, only tensile stress is applied to the screw shaft. Also, because the lower end of the screw shaft is pivotable, even if a hard and large incombustible material flows into the rising chamber 392, the lower end of the screw shaft can be pivoted to provide space for the hard and large incombustible material. have.

The fluidized bed separation chamber 390 accommodates the mixture 310b of the incombustibles and the fluidized medium 310, and separates the incombustibles and the fluided medium from each other. Separated second mixture 310f having a high concentration of incombustibles rises through the rising chamber 392. Thereafter, the second mixture 310f is discharged to a subsequent slagging combustion furnace (not shown) or the like through a non-combustible material outlet 317 provided in the upper portion of the rising chamber 392.

The concentration ratio of the incombustibles in the fluidized bed separation chamber 390 can be adjusted simply by controlling the delivery amount by the screw conveyor 378 in the rising chamber 392. In particular, if the amount of movement (rotation) of the screw conveyor 378 in the rising chamber 392 is reduced, the concentration ratio of the incombustibles in the fluidized bed separation chamber 390 may be increased. Further, if the clearance between the screw conveyor 378 and the casing of the rising chamber 392 is set to three times or more of the maximum diameter (ie, 0.8 mm) of the fluidized medium, the fluidized medium is non-combustible. It slides downward through the gap to concentrate the materials. In conventional incombustible material removal systems, the fluid medium is replenished into the fluidized bed by passing the fluid medium through an appropriately selected screen. According to the incombustible material removal system of the present invention, the process using such a screen can be omitted by appropriately setting the gap.

The proportion of incombustibles in the fluidized medium 310 in the fluidized bed furnace is generally in the range of about 3% to about 5%. The concentration of the incombustibles is regarded as the concentration for accumulating the incombustibles on the bottom of the fluidized bed 312 in order to maintain the good condition of the circulating fluidized bed 312. On the other hand, if municipal waste is fed into the fluidized bed furnace 305 as combustible waste 314 (combustible solids), the fluid medium 310 may be properly retired by a mechanical device such as a screw conveyor 378. The concentration of incombustibles is about 20%. The fluid medium 310 may be evaporated at a high concentration of about 30% to about 50% by adjusting the characteristics (size and shape) of the incombustible materials through crushing or the like.

Thus, in this embodiment, since the incombustibles are concentrated in the fluidized bed separation chamber 390, the amount of the second mixture 310f, which is a mixture of the incombustibles and the fluidized medium, discharged out of the system is conventionally known. Can be reduced to less than 1/10 of the system. In addition, the amount of the second mixture 310f withdrawn to the outside of the fluidized bed is reduced, and the second mixture 310f is cooled. Therefore, it is possible to simplify the cooling system for the fluidized medium. Since the amount of heat released to the outside of the system is reduced, the heat recovery efficiency in the system with the entire fluidized bed can be improved.

As described above, when the amount of transfer (rotation) of the screw conveyor 378 in the rising chamber 392 is reduced, the second mixture 310f of the fluid medium and the non-combustible materials is at a higher rate than the fluidized bed separation chamber. A problem may also arise that flows back to 390. In this case, it is possible to prevent the second mixture 310f from flowing back to the fluidized bed separation chamber 390 by setting the pressure of the fluidized bed separation chamber 390 to be higher than the pressure of the rising chamber 392. Do.

In order to increase the pressure of the fluidized bed separation chamber 390, the amount of fluidizing gas supplied from the side portion of the fluidized medium raising chamber 391 is reduced, and the porosity of the thin fluidized bed in the fluidized medium raising chamber 391 is reduced. Is reduced. In addition, the amount of fluidizing gas 331 supplied from the bottom surface 390b of the passage portion 390c in the fluidized bed separation chamber 390 through the supply ports 330 and 330a is reduced, so that the fluidizing gas 331 is reduced. Is not faster than the minimum fluidizing gas velocity, and the viscosity of the fluidized bed in the fluidized bed separation chamber 390 is increased to prevent the second mixture 310f from flowing back into the fluidized bed separation chamber 390. Will be.

4 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized bed furnace system 301 according to a third embodiment of the present invention. FIG. 4A is a front sectional view of the fluidized bed furnace system 301, and FIG. 4B is a side cross-sectional view of the fluidized bed furnace system 301.

The fluidized bed furnace system 301 includes a fluidized bed furnace 305 for retaining a fluid medium 310 therein and a non-combustible material eviction system 302a. The fluidized bed passage 305 includes a circulating fluidized bed 312 for forming a circulating fluid 306 of the fluid medium 310. The non-combustible material eviction system 302a includes a mixture delivery path 316 disposed below the bottom of the circulating fluidized bed 312, a fluidized bed separation chamber 390 provided at the delivery end of the mixture delivery path 316, and the fluidized bed separation. A fluid medium raising chamber 391 provided as a conveying passage above the chamber 390 and a rising chamber 392 provided as a nonflammable discharge passage downstream of the fluidized bed separation chamber 390. The fluidized bed separation chamber 390 has a passage portion 390c having a bottom surface 390b. The passage portion 390c and the bottom surface 390b are configured in the same manner as in the second embodiment.

Combustible wastes (not shown) are fed into the fluidized bed furnace 305. Incombustibles in the combustible wastes are discharged out of the fluidized bed furnace 305 together with the fluidized medium 310 through the mixture delivery path 316. A screw conveyor 320 is provided in a substantially horizontal direction in the mixture delivery path 316 to allow a mixture of the non-combustible material and the fluid medium 310 to flow into the fluidized bed separation chamber 390.

The screw conveyor 320 in the mixture delivery passage 316 is rotatably supported. Cooling gas 340 for cooling the flow medium is supplied from lower portions of the screw conveyor 320. As the cooling gas 340, steam is usually used. However, if the flow medium does not have combustible materials that are not substantially combusted, a gas containing oxygen, such as air, may be used as the cooling gas 340.

The cooling gas 340 is supplied at a flow rate lower than the minimum fluidization rate, so that the cooling gas 340 is not mixed with the high temperature fluid medium 310 located above the circulating fluidized bed 312. In order to increase the separation function of the screw conveyor 320, it is also effective to supply the cooling gas 340 at a flow rate of 2 to 3 times the minimum fluidization rate. By cooling the fluid medium 310 positioned below the circulating fluidized bed 312, the screw conveyor 320 is prevented from being cooled.

In particular, if the screw conveyor 320 is cooled, water is conversely liquefied onto the surfaces of the screw. On the other hand, if the concentration of the incombustibles is high, a large mixture of the incombustibles and the fluid medium 310 is evaporated, and water is supplied from the lower portions of the screw conveyor 320 instead of the cooling gas 340. May be

As described above, the fluidized bed separation chamber 390 is top of the non-combustible materials toward the bottom surface 390b and the fluid medium 310 by the fluidizing gas 331 supplied from the bottom surface 390b. And inseparably separate the incombustibles and the fluid medium from each other. The first mixture 310g collected on top of the fluidized bed separation chamber 390 contains the fluidized medium 310 as a main component. The first mixture 310g is moved to the fluid medium raising chamber 391 provided above the fluidized bed separation chamber 390 according to the upward flow of the fluidizing gas 331. The first mixture 310g raised through the fluid raising chamber 391 flows over the loop seals of the weirs 395a and 395b in the fluid raising chamber 391 and flows into the fluidized bed. It is conveyed to the said fluidized-bed path 305 through the conveyance port 393a provided in the upper part of 305. As shown in FIG.

The height of the lowest position 391a of the connection portion of the conveyance port 393a and the fluid medium raising chamber 391 is dense so that it is not affected by the pressure fluctuation of the circulating fluidized bed 312 in the fluidized bed passage 305. It is located above the interface (top surface of the circulating fluidized bed 312) of one fluidized bed. The fluid medium raising chamber 391 has weirs 395a and 395b on the fluid medium outlet 393a. The weirs 395a and 395b fill the fluid medium outlet 393a with a first mixture 310g containing a fluid medium as a main component, and the gas in the fluidized bed passage 305 causes the fluid medium raising chamber ( 391) to seal the pressure difference from the fluidized bed passage 305 to prevent flow into it.

For example, the fluid raising chamber 391 may include a fluidizing gas 398 into the fluid raising chamber 391 to facilitate ejection of the first mixture 310g mainly containing the fluid. Dispersion nozzles may be provided on the side wall of the fluid medium raising chamber 391 for supplying. The fluidizing gas 398 serves to move the fluid medium upward. The fluidizing gas 398 may increase and decrease the fluidization rate of the fluidizing gas passing through the fluid medium raising chamber 391, and thus upwardly of the first mixture 310g through the fluid medium raising chamber 391. You can adjust your momentum.

When the fluidization rate in the fluid raising chamber 391 is increased, the concentration of the fluid in the fluid raising chamber 391 is lowered. Therefore, the first mixture 310g can be raised without causing a large pressure increase in the fluidized bed separation chamber 390.

As described above, the fluid medium raising chamber 391 is provided with a fluidization gas outlet 397 on top of the fluid medium raising chamber 391. The fluidizing gas 331 supplied from the bottom surface 390b of the passage portion 390c in the fluidized bed separation chamber 390 and the fluidizing gas 398 supplied from the sidewall of the fluid medium raising chamber 391 are the fluidizing gas. It is discharged through the outlet 397. The fluidizing gases 331, 398 may be used as secondary combustion gas in the fluidized bed furnace 305. In this case, the fluidization gas outlet 397 and the fluid carrier port 393a may be integral with each other, and at least the weir 395b may be omitted.

The fluidizing gas 398 supplied from the side wall of the fluidized medium raising chamber 391 is the same as the fluidizing gas 331 or air supplied from the bottom surface 390b of the passage portion 390c in the fluidized bed separation chamber 390. It may also comprise a gas of the same type as the gas containing oxygen.

The fluidizing gas 398 supplied from the side wall of the fluid raising chamber 391 does not flow below the fluid raising chamber 391 unless pressure equilibrium is lost beyond a large range. Thus, a gas containing oxygen can be used because it does not cause clinker problems of the mixture.

Since the gas containing oxygen can be supplied from the side wall of the fluid raising chamber 391, even if the first mixture 310g contains unburned combustible materials such as charcoal, the first mixture 310g. The fluid may be burned in the raising chamber 391. Therefore, it can be expected that the fluid medium can be cleaned and the loss of unburned combustible materials can be reduced. In addition, the fluidized medium may be increased in temperature by combustion of unburned combustible materials in the first mixture 310g and may be returned directly to the fluidized bed furnace 305. Therefore, it is possible to improve the thermal efficiency of the fluidized bed furnace 305.

On the other hand, the second mixture 310f of the fluid medium and the incombustibles, in which incombustibles are concentrated near the bottom surface 390b of the passage portion 390c in the fluidized bed separation chamber 390, is formed in the passage portion 390c. Is supplied into the rising chamber 392 along the bottom surface 390b. The rising chamber 392 is a fluid carrier delivery device such as a screw conveyor 378 provided to the rising chamber 392 to move the second mixture 310f of the fluid and non-combustible materials upward in the vertical direction. It is provided. The second mixture 310f is discharged from the incombustible material discharge port 317 provided on the rising chamber 392.

The lowest position 317a of the non-combustible material outlet 317 may be arbitrarily set according to the required floor height of the rising chamber 392. The required bed height of the rising chamber 392 can achieve the sealing performance necessary to maintain the pressure in the fluidized bed separation chamber 390 higher than the internal pressure of the mixture delivery path 316 in the fluidized bed furnace 305. The height of the fixed bed of the fluidized medium. Typically, the required bed height of the rising chamber 392 is higher than the height of the surface of the circulating fluidized bed 312 (dense fluidized bed).

The height of the non-combustible material outlet 317 is not limited to the above example in connection with the height of the fixed bed of the fluid medium, it may be set higher than the above example. For example, the height of the non-combustible material outlet 317 may be set higher than the position 392a that is 1 m in the vertical direction above the floor 390a of the fluidized bed separation chamber 390, and also It may be set higher than the height of the fixed bed.

Thus, the sealing performance to the outside of the rising chamber 392 may be arbitrarily designed by adjusting the height of the incombustibles outlet 317. Therefore, the height of the fluidized bed in the fluidized bed furnace 305 which has been limited so far can be designed more flexibly. Accordingly, the fluidized bed system 301 can be made larger and more flexible.

In the rising chamber 392, when the amount of movement (rotation) of the screw conveyor 378 as the fluid medium delivery device is reduced, the concentration of non-combustible substances in the second mixture 310f discharged externally may be increased. have. In this case, a problem may occur in that the second mixture 310f in the rising chamber 392 flows back to the fluidized bed separation chamber 390 at a higher rate.

In order to prevent the second mixture 310f from flowing back into the fluidized bed separation chamber 390, the amount of fluidizing gas 398 supplied from the side wall of the fluidized medium raising chamber 391 is reduced, and the flow The porosity of the thin fluidized bed in the medium raising chamber 391 is reduced, and the pressure of the fluidized bed separation chamber 390 is increased. In addition, when the moving speed (rotational speed) of the screw conveyor 320 provided in the mixture delivery path 316 is increased, the pressure of the fluidized bed separation chamber 390 may be increased.

Therefore, in the fluidized bed furnace system 301 according to the present embodiment, since the second mixture 310f having an increased concentration of non-combustible materials is evaporated, the second mixture is a mixture of the fluidized medium and the non-combustible materials discharged to the outside of the system. The amount of mixture 310f can be reduced to less than one tenth of conventional systems.

In addition, the second mixture 310f of the incombustibles and the fluid medium to be evicted is brought into contact with the fluidizing gas 331 in the fluidized bed separation chamber 390 and cooled directly by it. Therefore, the amount of the second mixture 310f withdrawn to the outside of the system can be reduced, while the second mixture 310f can be cooled. Therefore, it is possible to simplify the cooling system for the fluid medium. Since the amount of heat released to the outside of the system is reduced, the heat recovery efficiency in the system 301 with the whole fluidized bed can be improved.

This embodiment also has the following advantages. The incombustibles outlet is not provided below the fluidized bed, unlike conventional systems. Therefore, the height of the fluidized bed furnace 305 can be reduced compared to conventional systems. Therefore, it is possible to easily install the fluidized bed passage 305 without having to dig a pit for the fluidized bed on the ground.

Thus, it is possible to reduce the time and cost required to install the fluidized bed furnace 305 and to simplify the structures for installation. All components in the system, including a waste supply system, ie a supply system for supplying combustible wastes (not shown) into the fluidized bed furnace 305, are affected by the fluidized bed furnace 305, The reason is that the installation heights of the components can be adjusted according to the installation height of the fluidized bed 305. Thus, it is possible to significantly reduce the time and cost required to construct the entire installation.

5 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized bed furnace system 301 according to a fourth embodiment of the present invention. The fluidized bed furnace system 301 includes a fluidized bed furnace 305 and a noncombustible material removal system 302a. The incombustible material removal system 302a includes a mixture delivery path 316, a fluidized bed separation chamber 390, a fluidized medium raising chamber 391 as a conveying passage, and a rising chamber 392 as a noncombustible discharging passage. The fluidized bed furnace system 301 also includes a first differential pressure gauge 406 for measuring the height of the fluidized bed based on the upper and lower pressures of the fluidized bed furnace 305, a fluidized bed disposed downstream of the fluidized bed furnace 305. A pressure detector 415 for measuring the pressure in the separation chamber 390, a second differential pressure gauge for measuring the sealed differential pressure based on the lower pressure of the fluidized bed passage 305 and the pressure of the fluidized bed separation chamber 390 413, a first control valve 420 connected to a temperature controller 416 for supplying cooling gas 340 to the mixture delivery path 316 disposed below the fluidized bed passage 305, the fluidized bed separation chamber ( A second control valve 418 connected to the pressure detector 415 in the fluidized bed separation chamber 390 for supplying the fluidizing gas 331 to the bottom surface 390b of the passage portion 390c in the 390, the fluid medium rising Fluidized gas 398 is supplied to the side portion of the chamber 391. A third control valve 412 connected to the second differential pressure gauge 413 for supplying the fluidizing gas 398 to the vicinity of the weir 395b provided at an upper portion of the fluid medium raising chamber 391. 4 a control valve 408, a temperature controller 416 for controlling the temperature of the fluid medium in the fluidized bed separation chamber 390, and a screw rotatably supported to withdraw the fluidized medium from the bottom of the fluidized bed furnace 305 In response to control signals from a conveyor 320, a drive motor 400 for driving the screw conveyor 320, the temperature controller 416 and a pressure detector 415 in the fluidized bed separation chamber 390. A first rotational speed controller 419 for controlling the rotational speed of the drive motor 400, a screw conveyer disposed rotatably as a fluid delivery device in the rising chamber 392 downstream of the fluidized bed separation chamber 390. A gear 378, a drive motor 401 for driving the screw conveyor 378, and a second rotational speed controller 402 for controlling the rotational speed of the drive motor 401. The operation of the fluidized bed furnace system 301 will now be described below with reference to FIG. 5.

The first differential pressure gauge 406 includes a first pressure detector 404 for measuring the pressure at the top of the fluidized bed 305 and a second pressure detector for measuring the pressure at the bottom of the fluidized bed 305. 407 is connected. The first differential pressure gauge 406 measures the height of the fluidized bed based on the pressures at the top and bottom of the fluidized bed 305 transmitted from the first and second pressure detectors 404, 407.

The second differential pressure gauge 413 is the pressure of the separation chamber 390 transmitted from the third pressure detector 415 and the pressure of the bottom of the fluidized bed passage 305 transmitted from the second pressure detector 407. The sealing pressure is measured based on this. The second differential pressure gauge 413 also controls the opening and closing of the third control valve 412 based on the measured data.

The third pressure detector 415 is configured to receive the pressure of the fluidized bed separation chamber 390 for accommodating the fluid medium discharged from the bottom of the fluidized bed passage 305 and controlling the opening and closing of the second control valve 418. Measure

The rotational speed controller 419 (SIC1) transmits a rotational speed control signal to the driving motor 400 to rotate the driving motor 400. Thus, the rotation speed controller 419 controls the rotation of the screw conveyor 320 having a rotation shaft extending in the horizontal direction.

The temperature controller 416 (TIC1) detects the temperature of the fluidized medium at the portion 411 where the fluidized medium is introduced into the fluidized bed separation chamber 390 from the transfer end of the screw conveyor 320. The temperature controller 416 is the control valve as a first control valve to control the amount of cooling gas 340 to cool the flow medium supplied from a plurality of feed ports provided at the bottom of the screw conveyor 320. The control signal corresponding to the detected signal is transmitted to 420 (CV1).

Thus, the temperature of the fluid medium at the portion 411 where the fluid medium is introduced into the fluidized bed separation chamber 390 is maintained below 450 ° C. by the controlled cooling gas 340. In this embodiment, steam is used as the cooling gas 340. Similar control methods can be applied when water is used as coolant 340 instead of steam. When the amount of unburned carbon is low in the fluidized medium, a gas containing oxygen such as air or combustion exhaust gas may be used as the cooling gas 340.

The pressure detector 407 (PIR2) obtains the pressure in the interior 409 of the circulating fluidized bed. The pressure detector 415 (PIR3) obtains the pressure of the portion 410 into which the fluid medium is introduced into the fluidized bed separation chamber 390. The pressure obtained by the pressure detector 407 and the pressure obtained by the pressure detector 415 are input into a subtractor 414 to generate a differential pressure between the interior 409 and the portion 410. do. The differential pressure is then input into differential pressure gauge 413 (DPIA2). The differential pressure gauge 413 controls the control valve 412 CV3 such that the pressure PIR3 of the portion 410 is higher than the pressure PIR2 of the interior (bottom) 409 of the circulating fluidized bed. Stays on.

In particular, the pressures in the fluidized bed 305 and the fluidized bed separation chamber 390 are continuously monitored by the differential pressure gauge 413. The relationship between the interior 409 of the circulating fluidized bed and the pressures in the portion 410 is primarily a control valve 412 for fluidized gas supplied from the side of the fluidized medium raising chamber 391 to reduce the amount of fluidized gas. Is controlled by controlling

If the pressure PIR3 of the portion 410 into which the fluid medium flows from the screw conveyor 320 into the fluidized bed separation chamber 390 is lower than a management value, the second mixture 310f may become the rising chamber. 392). Therefore, when the pressure PIR3 of the portion 410 is lower than a preset value, the control valve 418 CV2 is throttled from the bottom surface 390b in the fluidized bed separation chamber 390. The amount of fluidizing gas 331 to be supplied into the passage portion 390c is controlled. Thus, fluidization of the fluidized bed separation chamber 390 is weakened to prevent the second mixture 310f from flowing back from the rising chamber 392. Alternatively, the rotation speed controller 419 controls the screw conveyor 320 to increase the rotation speed of the screw conveyor 320. Thus, the amount of movement of the fluid medium is increased to prevent the second mixture 310f from flowing again from the rising chamber 392.

As the rotational speed of the screw conveyor 320 is increased, the temperature TIC1 at the portion 410 is increased above a predetermined value. Therefore, the amount of the fluidizing gas 331 supplied from the bottom surface 390b of the passage portion 390c in the fluidized bed separation chamber 390 is first reduced to weaken the fluidization of the mixture.

The first differential pressure gauge 406 (DPIR1) is connected to the first pressure detector 404 (PIR1) and the second pressure detector 407 (PIR2) through a subtractor 405. The first differential pressure gauge 406 is a differential pressure between the pressure PIR1 of the top 403 of the freeboard of the fluidized bed 5 and the pressure PIR2 of the interior (bottom) 409 of the circulating fluidized bed. Is detected and the height of the circulating fluidized bed is monitored.

When the fourth control valve 408 (CV4) is opened, fluidizing gas 398 (air) is supplied into a loop seal provided upstream of the conveying port 393a, and from the fluid medium raising chamber 391 The fluidized medium is conveyed into the fluidized bed passage 305. The loop seal divides the fluid medium raising chamber 391 and the fluidized bed passage 305 and includes weirs 395a and 395b provided on an upper portion of the fluidized bed raising chamber 391. The loop seal is basically supplied with air as the fluidizing gas 398 at a fixed flow rate. For example, the flow rate is fixed at about twice the minimum fluidization rate.

The screw conveyor 378 is suspended from the top of the rising chamber 392 and cantilevered to the top. The drive motor 401 is connected to the screw conveyor 378. The second rotational speed controller 402 (SIC2) transmits a rotational speed control signal to the driving motor 401 to rotate the driving motor 401. Thus, the second rotational speed controller 402 controls the rotation of the screw conveyor 378. The screw conveyor 378 is usually operated at a fixed rotational speed.

In this embodiment, the bottom surface 390b is inclined downward with respect to the rising chamber 392. The passage portion 390c has a vertical cross section that gradually widens toward the rising chamber 392. According to this configuration, the mixture can be smoothly delivered to the lower portion of the rising chamber 392.

The fluidizing gas 331 is supplied from the bottom surface 390b of the passage portion 390c in the fluidized bed separation chamber 390 to form a thin fluidized bed above the fluidized bed separation chamber 390. The fluidizing gas 398 is supplied from an intermediate portion of the fluid medium raising chamber 391. A conveyance port 393a is provided at an upper portion of the fluid medium raising chamber 391 as an opening communicating with the fluidized bed passage 305. The first mixture 310g mainly containing the fluid medium ejected from the fluid medium raising chamber 391 is conveyed to the fluidized bed furnace 305 through the conveying port 393a.

6 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized-bed gasification and slagging furnace system 301a according to a fifth embodiment of the present invention. The fluidized bed vaporization and slagging furnace system 301a includes a fluidized bed vaporization furnace 305a and a non-combustible material eviction system 302a as a fluidized bed furnace. The non-combustible material eviction system 302a is a mixture delivery passage 316 disposed below the fluidized-bed gasification furnace 305a, a fluid passage chamber 391 as a conveying passage provided downstream of the mixture delivery passage 316, A nonflammable discharge passage includes a rising chamber 392 and a slagging combustion furnace 431 connected to the discharge duct 322 of the fluidized-bed gasification furnace 305a. The fluidized-bed gasification furnace 305a, the mixture delivery passage 316, the fluid medium raising chamber 391, and the rising chamber 392 have the same structures as the first embodiment, and will not be described repeatedly. The fluidized-bed gasification furnace 305a shown in FIG. 6 corresponds to the fluidized-bed furnace 305 shown in FIG.

The slagging combustion furnace 431 includes a primary chamber 429, a secondary chamber 428, and a tertiary chamber 430. The pyrolyzed gas is introduced into the gas inlet 423 from the discharge duct 322 of the fluidized-bed gasification furnace 305a through the pipe 424. The pyrolyzed gas is completely burned in the primary chamber 429 and the secondary chamber 428 to melt the ash into slag. Unburned combustible gas is completely burned in the tertiary chamber 430.

Exhaust gas from the fluid medium raising chamber 391 is preferably supplied from the fluidizing gas outlet 397 into the tertiary chamber 430 of the slagging combustion furnace 431 through a pipe 422. Since the exhaust gas from the fluid medium raising chamber 391 has a low concentration of oxygen, it is not suitable as an oxidant for combustion. If the exhaust gas from the fluid medium raising chamber 391 is supplied to the primary chamber 429 or the secondary chamber 428 of the fluidized-bed gasification furnace 305a or the slagging combustion furnace 431, the ash is Suppresses the temperature rise required to melt into slag.

The present invention is not limited to the configuration in which the exhaust gas is supplied to the tertiary chamber 430 of the slagging combustion furnace 431 through the pipe 422. For example, since the exhaust gas from the fluid medium raising chamber 391 is heated to approximately 500 ° C. by heat exchange with the fluid medium, the exhaust gas from the fluid medium raising chamber 391 adversely affects the temperature rise. This is less. Thus, if the exhaust gas from the fluid medium raising chamber 391 has an oxygen concentration of at least 15%, the primary chamber 429 or the secondary chamber of the slagging combustion furnace 431 through the pipe 421. 428 may be supplied. If the amount of unburned combustible materials in the fluidized medium is low, the fluidized bed system may have this configuration. In either case, the present invention has significant advantages over conventional systems for retiring high temperature fluid media and treating the fluid media with heat loss.

In the slagging combustion furnace 431, the pyrolyzed gas is melted into slag in the primary chamber 429 and the secondary chamber 428, and the slag is the bottom 433 of the slagging combustion furnace 431. ) Falls into the phase. Slag 434 on the bottom 433 of the slagging combustion furnace is discharged from the bottom 433 of the slagging combustion furnace.

As described above, the fluidized bed vaporization and slagging furnace system 310a of this embodiment is downstream of the fluidized bed separation chamber 390 to deliver the second mixture 310f of the fluidized medium and non-combustible materials in an upward direction. Rising chamber 392 provided in the. Accordingly, the second mixture 310f having a high concentration of incombustible material can be discharged out of the system from a position higher than the surface of the circulating fluidized bed 312 (dense fluidized bed) of the fluidized-bed gasification furnace 305.

In this embodiment, a suspension-type screw conveyor 378 for moving the second mixture 310f in the vertical upward direction has a rise with a substantially cylindrical wall having an angle of approximately 90 ° with respect to the horizontal plane. It is preferably used as a fluid delivery device provided in the chamber 392.

7 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized-bed gasification furnace system 301b according to a sixth embodiment of the present invention. The fluidized-bed gasification furnace system 301b includes a fluidized-bed vaporization furnace 305a and a non-combustible material eviction system 302a (partially shown). The fluidized-bed gasification furnace 305a holds therein a fluid medium 310 that forms a circulating fluid 306 in a substantially cylindrical reservoir. The non-combustible material eviction system 302a is a non-combustible material evident chute as a mixture delivery path for retiring the fluid medium 310 forming the circulating fluid 306 from the furnace bottom 311. 307, a horizontal fluidized media eviction path 316d as a mixture delivery path provided below the non-combustible material eviction chute 307, and a screw conveyor 320 provided in the horizontal fluidized media eviction path 316d. . The horizontal fluid medium eviction path 316d includes a mixture outlet 440 formed near the transfer end of the screw conveyor 320. The non-combustible material eviction system 302a also includes a fluidized bed separation chamber (not shown) for receiving a mixture of fluid and non-combustible materials discharged from the mixture outlet 440, and a fluidized medium raising chamber (not shown) as a conveying passage. And a rising chamber (not shown) as the incombustibles discharging passage. The fluidized-bed gasification furnace system 301b is provided on a pressure sensor 437 provided in an area where gas is supplied to form a circulating fluid 306 of the fluidized medium and an outer wall of the incombustible material evident chute 307. A pressure measuring device 438 (PIR2) connected to a temperature sensor 435, a pressure sensor 437 for measuring the pressure of the bottom of the fluidized-bed gasification furnace 305a, and an outer wall of the incombustible eviction chute 307 And a temperature measuring device 436 (TIA) connected to a temperature sensor 435 for detecting the temperature of the sensor.

In FIG. 7, the portion 315 near the inlet of the incombustible material chute 307 has high partial pressure oxygen. Accordingly, the incombustibles and the fluid medium tend to be increased in temperature. Therefore, in order to fluidize the portion 315 in the incombustibles material chute 307, steam 439 is supplied as a purge gas from a side near the portion 315, thereby producing a clinker. Will be prevented. The purge gas 439 also cools the non-combustible material chute 307 to lower the temperature of the fluidized medium and the non-combustible materials.

The pressure measuring device 438 (PIR2) measures the pressure of the fluidized bed passage 305 and controls the pressure of the purge gas 439 so that the pressure of the incombustible material evident chute 307 becomes the fluidized bed furnace ( The pressure is higher than 5).

In addition, the temperature measuring device 436 detects the temperature of the outer wall of the incombustibles material chute 307 and monitors the temperature of the incombustibles material chute 307 so that the clinker generation temperature does not exceed qualitatively. . If the temperature sensor 435 connected to the temperature measuring device 436 protrudes from the side wall into the incombustible material chute chute 307, the fluid medium and the incombustibles flow down due to gravity and are discharged. To prevent them. Therefore, the temperature sensor 435 is provided on the outer wall of the non-combustible material evident chute 307, the temperature measuring device 436 detects the temperature of the outer wall of the non-combustible material evident chute 307.

8 is a schematic diagram illustrating a non-combustible material eviction system in the fluidized-bed gasification furnace system 301b according to the seventh embodiment of the present invention. The fluidized-bed gasification furnace system 301b includes a fluidized-bed vaporization furnace 305a and a non-combustible material eviction system 302a (not shown). The fluidized-bed gasification furnace 305a includes a circulating fluidized bed 312 and a freeboard 348 located above the bottom 346 of the furnace. The non-combustible material eviction system 302a is a mixture delivery path disposed below the bottom 346 of the furnace and disposed in the fluid media eviction 316 and the lower horizontal portion 316d of the fluid eviction 316. A screw conveyor 320 is provided. The non-combustible material eviction system 302a also includes a fluidized bed separation chamber (not shown) for receiving a mixture of fluid and non-combustible materials discharged from the mixture outlet 440, and a fluidized medium raising chamber (not shown) as a conveying passage. And a rising chamber (not shown) as the incombustibles discharging passage. The fluidized media retirement passage 316 has a mixture outlet 440 provided on the lower horizontal portion 316d near the transfer end of the screw conveyor 320. The fluid medium eviction passage 316 includes the lower horizontal portion 316d and a non-combustible substance eviction chute 307 provided in the vertical direction.

Combustion air 324 with high temperature is supplied from the bottom 346 of the furnace. The combustion air 324 creates an internal rotational flow of the fluid medium 310 in the circulating fluidized bed 312. Wastes 314 are supplied into the fluidized-bed gasification furnace 305a to come into contact with the circulating fluidized bed 312 having a temperature of 450 ° C to 650 ° C. Thus, the wastes 314 are pyrolyzed and vaporized to produce combustible gas. The combustible gas is discharged as exhaust gas from the discharge duct 322 provided above the freeboard 348 to the outside of the fluidized-bed gasification furnace 305a.

The fluid medium eviction path 316 retracts the fluid medium 310 from the bottom 346 of the furnace and transfers the fluid medium 310 toward the right side of FIG. 8 in a horizontal direction by a screw conveyor 320. Play a role. The delivered fluid medium 310 is discharged from the mixture outlet 440 and transferred to the fluidized bed separation chamber (not shown).

A purge gas supply port 330 is provided between the bottom 364 of the fluidized media retreat 316 and the bottom 346 of the furnace for supplying purge gas, such as steam. For example, when the internal pressure P0 of the circulating fluidized bed 312 is set to 15 kPa, purge gas is supplied from the purge gas supply ports 330, and thus, near the purge gas supply ports 330. The pressure P1 is approximately 17 kPa above the pressure P0.

The pressure P2 near the outlet of the fluid medium evaporation passage 316 is maintained to be a few kilopascals slightly above atmospheric pressure due to the sealing performance of the fluid medium raising chamber (not shown) and the rising chamber (not shown). Can be. The pressure P2 near the outlet of the fluidized media eviction passage 316 may be atmospheric pressure as long as the pressure P1 near the purge gas supply ports 330 can be maintained to be approximately 17 kPa.

Under the pressure conditions, purge gas is supplied from the purge gas supply ports 330 into the fluid medium retirement path 316, so that the vicinity of the bottom 346 of the circulating fluidized bed 312 and the fluid medium retirement path ( From 316 it is purged the unburned gas and the combustion gas 324 contained in the fluid medium.

In this case, the following relationship must be maintained between the internal pressure P0 of the circulating fluidized bed 312, the internal pressure P1 of the fluidized media eviction passage 316, and the internal pressure P2 near the outlet of the fluidized media eviction passage 316. do.

P0 <P1> P2

In the present embodiment, when the purge gas is supplied from the purge gas supply ports 330, the outlet of the fluid medium evaporation path 316 is raised to the fluid medium to maintain the relationship (P0 <P1> P2) It may be sealed by a chamber (not shown) and a rising chamber (not shown).

In this embodiment, a belt conveyor or a chain conveyor may be used as the conveyor 320 provided in the fluid medium retirement path 316. In addition, silica sand may be used as the fluid medium 310.

As the purge gas, an inert gas such as nitrogen gas or carbon dioxide may be used. Such nitrogen gas or carbon dioxide does not generate moisture even if the purge gas is cooled in the fluidized-media eviction path 316. Thus, such nitrogen gas or carbon dioxide can maintain a dry environment and do not produce smoke (steam) even if it is released outside of the fluidized media eviction path 316.

Since the mixture of fluid and non-combustible materials is cooled, the fluid rise chamber (not shown) and rising chamber (not shown) as non-combustible discharge passages can have margins in their design, Sealing performance can be effectively maintained.

Therefore, it is not necessary to extend the incombustibles material chute 307 to ensure material sealing effects of the mixture. Even if the incombustibles material chute 307 is installed on the ground, the fluidized-bed gasification furnace 305a can be reduced in height compared to a conventional system. Thus, it is possible to reduce the cost for the installation of the fluidized bed furnace system.

9 is a schematic diagram illustrating a non-combustible material eviction system in a fluidized bed furnace system 301 according to an eighth embodiment of the present invention. The fluidized bed furnace system 301 includes a fluidized bed furnace 350 and a non-combustible material eviction system 302b. The fluidized bed furnace 350 includes a freeboard 348 and a circulating fluidized bed 342 formed above the bottom 346 of the fluidized bed furnace 350. The non-combustible material eviction system 302b is a fluid delivery path 316 as a mixture delivery path disposed below the bottom 346 of the furnace, a vertical furnace 376 and a vertical furnace 376 as non-combustible discharge passages. It has a horizontal (376a) as a non-combustible discharge passage connected to the top of the. The vertical furnace 376 includes a rising portion 344 inclined at an angle of 30 ° with respect to the vertical direction, and a discharge duct 352 for discharging the fluid medium 310 and the incombustibles 360 from the vertical furnace 376. And a non-combustible material outlet 358. The riser 344 is filled with a mixture of the fluid medium 310 and the incombustibles 360. The fluid medium 310 and the incombustibles 360 are discharged from the vertical furnace 376 through the incombustibles outlet 358, introduced into the horizontal furnace 376a, and then discharged out of the system. do.

In the circulating fluidized bed 312, hot combustion air 324 is supplied from the bottom 346 of the furnace through the diffuser plate 362 to create an internal rotary flow 342 of the fluidized medium. The fluidized bed 350 and the fluidized media eviction path 316 may have the same configurations as in the seventh embodiment, and will not be redundantly described.

The incombustibles outlet 358 is provided at the end of the rising portion 344 in the vertical passage 376. The mixture is discharged horizontally from the vertical passage 376 through the incombustibles outlet 358. The lowest position 358a of the incombustibles outlet 358 is located at a position higher than the top or average height of the surface 366 of the circulating fluidized bed 312 so that the fluid medium 310 is vertical due to its gravity. The incombustibles outlet 358 of the furnace 376 is filled or accumulated in the rising portion 344.

The incombustibles removal system 302b also includes a screw conveyor 378 disposed as a fluid carrier delivery device in the vertical furnace 376. The screw conveyor 378 has a vertical shaft. The fluid medium 310 delivered to the bottom of the vertical furnace 376 is included in the rotating screw conveyor 378 and is transferred to the top of the vertical furnace 376 by the screw conveyor 378.

The fluid medium 310 in the vertical furnace 376 is filled or accumulated in the rising portion 344 of the vertical furnace 376. The filled fluid medium 310 may maintain a sealing performance to prevent the pressure P1 near the purge gas supply holes 330 to which the purge gas 341 is supplied to decrease.

Instead of a double damper or lock hopper as a sealing device, the fluid medium 310 is filled in the rising portion 344 of the vertical furnace 376. Thus, sealing effects can be improved. At the same time, the height of the fluidized bed furnace system 301 can be reduced since it is not necessary to dig a pit for accommodating the double damper below the fluidized media retreat 316. Accordingly, it is possible to reduce the time and cost required to install the fluidized bed furnace system 301.

The purge gas 341 may prevent the unburned gas contained in the circulating fluidized bed 312 from being introduced into the inlet or vertical path 376 of the fluidized media eviction path 316. It is not necessary to provide a special sealing device to prevent the leakage of purge gas. Therefore, it is possible to simplify the process of digging a pit for accommodating such a sealing device. Accordingly, the fluidized bed 350 may be installed at a lower position than the conventional system, and the cost for configuring the fluidized bed 350 may be reduced.

The fluid medium 310 discharged from the vertical furnace 376 is then discharged to the outside of the non-combustible material outlet 358 through the horizontal path 376a. The discharged fluid medium 310 and the incombustibles 360 undergo a separation process in a slagging combustion furnace (not shown) provided outside the fluidized bed 350 to treat the incombustibles. Thereafter, the fluid medium 310 and the incombustibles 360 are respectively restored.

On the other hand, the purge gas 341 is discharged from the discharge duct 352 and supplied to the exhaust boiler 356 through the supply passage 354. Thus, the purge gas 341 can be reused as a heat source. In addition, a portion of the steam discharged from the discharge duct 352 is supplied to the freeboard 348, so that the combustible gas and the water-gas reaction occurs in the freeboard 348. The endothermic reaction in the water-gas reaction can lower the temperature of the freeboard 348 to an appropriate value.

Thus, in this embodiment, the fluid medium delivery device provided in the vertical passage 376 comprises a screw conveyor 378 for delivering the mixture in an inclined direction having an internal angle of at least 60 ° with respect to the horizontal plane. It is preferable.

10 is a schematic diagram showing a non-combustible material eviction system 302b in a vaporization system according to a ninth embodiment of the present invention. The non-combustible material eviction system 302b includes a mixture delivery passage 372 including a horizontal portion 372a for delivering the fluid medium 310 in a substantially horizontal direction, and a horizontal portion of the mixture delivery passage 372. A screw conveyor 377 rotatably supported in the horizontal direction within the 372a, a ramp 374 provided at the transmission end of the horizontal part 372a of the mixture delivery path 372, and the ramp 374 Vertically 376 as a non-combustible material discharge passage extending in a vertical direction from the bottom of the screw, a screw conveyor 378 rotatably supported as a fluidized medium delivery device, and a fluidized medium 310 from the top of the verticalized path 376. And an incombustibles outlet 358 for discharging the incombustibles 360. The screw conveyor 378 is suspended from the top of the vertical passage 376 and cantilevered at the top.

The horizontal portion 372a of the mixture delivery passage 372 serves to transfer the fluid medium 310 toward the right side of FIG. 10 in the horizontal direction by the rotation of the horizontal shaft of the screw conveyor 377. The mixture delivery path 372 serves to transfer the fluid medium 310 to the top of the ramp 374 provided at the right end of the mixture delivery path 372. The fluid medium 310 flows to the bottom of the vertical path 376 through the ramp 374 due to gravity.

The vertical furnace 376 is connected to the inner wall of the vertical furnace 376 by the rotation of the screw conveyor 378 so as to transfer the fluid medium 310 upwardly to the upper portion of the vertical furnace 376. It serves to carry the fluid medium 310 that accumulates on the bottom of the vertical passage 376 between the screw vanes of the vertical screw conveyor 378. The fluid medium 310 delivered by the vertical screw conveyor 378 toward the top of the vertical passage 376 is then discharged from the incombustibles outlet 358 due to its gravity along with the incombustibles 360. It is discharged out of the vertical furnace 376. The discharged incombustibles 360 may be restored and effectively utilized outside the fluidized bed 350 (see FIG. 9).

For example, the restored non-combustible material 360 can be used as sand for road pavement with asphalt. Recyclable silica sand is returned to the fluidized bed. Since the restored incombustibles 360 contain substantially no unburned gas, there is no unburned gas released to the atmosphere.

As shown in FIG. 10, the lowest position 358a of the incombustibles outlet 358 is located at substantially the same height as the height of the horizontal portion 372a of the mixture delivery path 372 as the incombustibles outlet. . If the fluid medium 310 can be filled into the rising portion 344 to seal the purge gas 341 (see FIG. 9), the lowest position of the non-combustible material outlet 358 is shown in FIG. 10. It may be located at location 358a. As long as the fluid medium 310 can be filled into the rising portion 344 to seal the purge gas 341, the lowest position of the non-combustible material outlet 358 is the surface of the circulating fluidized bed 312 ( It may be located at location 358a shown in FIG. 9 higher than the height of 366.

The vertical furnace 376 has a rough inner surface 382 at the top of the vertical furnace 376. The rough inner surface 382 has a higher roughness than that of the lower inner surface. The vertical screw conveyor 378 has a screw vane designed to have a small horizontal cross section within a range facing the rough inner surface 382, so that a large gap between the screw vane and the rough inner surface 382 is achieved. To have. For example, the gap between the screw vane and the coarse inner surface 382 may be set to at least three times the maximum particle diameter of the flow medium. According to this configuration, the fluid medium 310 and the non-combustible material 360 is easy to flow downward in the vertical path 376 due to the gravity, the sealing effect can be increased.

On the other hand, the vertical furnace 376 has a smooth liner 380 at the bottom of the vertical furnace 376. The liner 380 has a lower roughness than the upper inner surface. The vertical screw conveyor 378 has a screw vane designed to have a large horizontal cross section within the range facing the liner 380, so as to have a small gap between the screw vane and the liner 380. do. For example, the gap between the screw vane and the liner 380 is preferably set to be smaller than three times the maximum particle diameter of the flow medium.

The upper and lower inner surfaces of the rising portion 344 in the vertical furnace 376 are formed in a continuous manner. The upper inner surface of the rising portion 344 is designed to have a large gap (eg, more than three times the maximum particle diameter of the fluid medium) between the upper inner surface and the screw vane. The lower inner surface of the rising portion 344 is designed to have a small gap (eg, less than three times the maximum particle diameter of the fluid medium) between the lower inner surface and the screw vane.

Next, the operation of the vertical furnace 376 will be described below. Since the gap between the top of the vertical furnace 376 and the screw vanes toward the rough inner surface 382 is large, the transfer efficiency of the fluid medium 310 is low. On the other hand, since the gap between the lower portion of the vertical passage 376 and the screw vanes toward the liner 380 is small, the transfer efficiency of the fluid medium 310 is high.

Due to the difference in the transfer efficiency in the vertical furnace 376, the fluid medium 310 at the bottom of the vertical furnace 376 pushes the fluid medium 310 at the top of the vertical furnace 376. When the fluid medium 310 is newly supplied to the lower portion of the vertical furnace 376, the fluid medium 310 at the upper portion of the vertical furnace 376 is discharged to the non-combustible material outlet 358.

When the fluid medium 310 is not newly supplied to the lower portion of the vertical passage 376, the fluid medium 310 may not be pushed toward the incombustible material outlet 358. However, since the fluid medium 310 is accumulated or filled in the rising portion 344 extending continuously from the top to the bottom of the vertical passage 376, the rising portion 344 as shown in FIG. An air gap 384 is formed below. The air gap 384 serves as a space to be filled with a purge gas formed at the bottom of the vertical passage 376 when the fluid medium 310 is not sufficiently supplied from the ramp 374.

A fluid storage chamber (not shown) may be provided to preferably form an air gap in the portion that interconnects the mixture delivery passage 372 and the vertical passage 376. The fluid storage chamber may comprise a tank having a predetermined volume.

Since the fluid medium 310 accumulates or fills in the rising portion 344 of the vertical furnace 376, the purge gas introduced from the mixture delivery path 372 maintains the purge gas in the air gap 384. Can be sealed. Therefore, even if the vertical screw conveyor 378 is rotated at a rotation speed within a wide range, a sufficient amount of the fluid medium 310 can be accumulated or filled in the rising portion 344.

In order to discharge the purge gas when the purge gas in the air gap 384 is included in the fluid medium 310 supplied from the ramp 374 and moved upward with respect to the upper portion of the vertical path 376. A discharge duct (see FIG. 9) may be provided at the top of the vertical furnace 376.

When the liner 380 disposed on the lower inner surface of the vertical furnace 376 has a low roughness and the gap between the screw vane and the liner 380 is set small, the vertical screw conveyor 378 is vertically connected. Suspended vertical conveyors may be used to be suspended from the top of 376.

In this case, a drive motor (not shown) may be provided at the top of the vertical path 376, and a vertical screw conveyor 378 may be rotatably supported at the top of the vertical shaft by the upper bearing. The lower end of the vertical screw conveyor 378 may be rotatably supported by the inner surface of the vertical passage (376). The vertical screw conveyor 378 may be rotated by the drive motor.

The vertical screw conveyor 378 may remove the lower bearing to rotatably support the lower end of the vertical screw conveyor 378 located at the bottom of the vertical passage (376). However, in order to increase the reliability, the lower bearing may be used to reduce the lateral vibration of the vertical screw conveyor 378 caused by the rotation of the vertical screw conveyor 378.

Thus, the intervals of maintenance of the vertical furnace 376 become longer to improve the operating ratio of the incombustible material eviction system 302b. In this embodiment, since the liner 380 having the smooth surface and the wear resistance is provided instead of the lower bearing, it is possible to effectively reduce the lateral vibration of the vertical screw conveyor 378.

In addition, the periods in which the air gap 384 is generated can be adjusted by adjusting the delivery capacity of the fluid medium 310 between the mixture delivery passage 372 and the vertical passage 376. For example, when the horizontal screw conveyor and the vertical screw conveyor have the same ability to transfer the fluid medium, the rotation speed of the horizontal screw conveyor 377 is set lower than the rotation speed of the vertical conveyor 378. . Accordingly, the delivery capacity of the horizontal screw conveyor 377 may be lower than that of the vertical screw conveyor 378. In this case, the period in which the air gap 384 exists in the portion connecting the vertical path 376 and the inclined path 374 may be longer, and the sealing effects of the purge gas may be increased.

In this example, the rotational speeds of the horizontal and vertical screw conveyors 377 and 378 are adjusted. However, in order to set the transfer capacity of the horizontal screw conveyor 377 so as to be lower than the transfer capacity of the vertical screw conveyor 378, the screw pitches of the horizontal screw conveyor 377 are the vertical screw. It may be set to be wider than the screw pitches of the conveyor 378, or may be set such that the screw diameter of the horizontal screw conveyor 377 is smaller than the screw diameter of the vertical screw conveyor 378. According to these configurations, the air gap 384 serves as a buffer in the incombustible eviction furnace to prevent leakage of the purge gas and to maintain the pressure of the purge gas in the mixture delivery path 372. Can play a role.

In a horizontal screw conveyor, gravity acts on the object to be transmitted as a force acting in a predetermined direction perpendicular to the screw shaft. However, in a screw conveyor having a screw shaft inclined at an enlarged angle of at least 60 with respect to the horizontal plane, small forces act in a predetermined direction perpendicular to the screw shaft. Forces acting in a predetermined direction perpendicular to the screw shaft are important for stable delivery by acting to prevent the object from rotating with the screw shaft. Thus, in order to maintain the transfer efficiency in a screw conveyor with a screw shaft inclined at an angle of at least 60 with respect to the horizontal plane, it is necessary to prevent the object from rotating with the screw shaft without gravity.

In order to prevent the object from rotating in the circumferential direction with respect to the rotating screw, it is possible to adopt friction forces between the object and the inner surface of the stationary screw casing. The friction forces preferably act in the circumferential direction, not in the direction of transmission, ie the axial direction of the screw shaft. In particular, it is preferable that irregularities are provided on the inner side of the screw casing which extends continuously in parallel with the screw shaft.

11 is a cross-sectional view of a screw conveyor 450 according to the present invention. 11 shows a cross section perpendicular to the screw shaft 451 of the screw conveyor 450. As shown in FIG. 11, the screw conveyor 450 has six protrusions 452 extending parallel to the screw shaft 451. The protrusions 452 protrude radially inward from the inner side of the screw casing 453. In FIG. 11, the protrusions 452 comprise C-channels attached to the inner side of the screw casing 453 by welding. Instead of the C-channels, L-shaped steels or flat bars may be used as the protrusions 452. According to this configuration, the object is prevented from rotating in the circumferential direction together with the rotating screw vane 454. Thus, stable delivery can be achieved.

However, depending on the characteristics (size and shape) of the non-combustible materials to be transferred, according to the configuration shown in FIG. 11, the non-combustible materials may engage the leading ends or the protrusions 452 of the screw vane 454. It may be. In order to prevent the engagement of the incombustible materials, it is necessary to properly select the gap between the tip portions of the screw vane 454 and the protrusions 452. For municipal solid waste, the gap between the protrusions 452 and the tip of the screw vane 454 should preferably be at least 20 mm, and may be in the range of 20 mm to 75 mm if necessary. have.

In addition, the gap between the inner surface of the screw casing 453 and the tip of the screw vane 454 is suitably designed such that the gap is small without the protrusions 452 extending parallel to the screw shaft 451. In the case, the same effects can be achieved. In particular, when the sizes of the non-combustible materials are smaller than the cross-sectional area of the protrusions 452, the non-combustible materials accumulate in the spaces between the adjacent protrusions 452. As a result, there are substantially no spaces between the adjacent protrusions 452. In such a case, the gap between the inner surface of the screw casing 453 and the tips of the screw vanes 454 may simply be adjusted to an appropriate small value without the protrusions 452.

The appropriate gap between the inner side of the screw casing 453 and the tip of the screw vane 454 depends on the characteristics (size and shape) of the non-combustible materials to be transferred, but in the case of municipal solid wastes, 75 mm or less, More preferably, it should be 50 mm or less, more preferably 25 mm or less. When the gap is set smaller, incombustibles are more likely to engage between the screw vanes 454 and the screw casing 453. Accordingly, the gap should not be excessively reduced. In the case of municipal solid wastes, it is preferred that the gap should be at least 5 mm, more preferably at least 10 mm, more preferably at least 15 mm.

Screw conveyors with screw shafts inclined at an enlarging angle of at least 60 ° with respect to the horizontal plane were originally designed to fill objects to be delivered in the screw conveyor and to prevent gas from leaking out of the furnace. The inventors have confirmed the performance of screw conveyors with an inclined screw shaft as follows. The greater the angle of inclination with respect to the horizontal plane, the more likely spaces are created on the rear face of the screw vane carrying the object. Therefore, gas tends to leak through these spaces. Accordingly, in order to maintain the gas sealing performance, it is necessary to block the spaces (gas passages) generated on the rear surface of the screw vane.

In order to block the spaces created on the rear face of the screw vane, a rear vane which is often used to reinforce the vanes can be used. In particular, a reinforcing member may be provided diagonally on the rear face of the screw vane by welding. Alternatively, ribs may be provided on the rear face of the screw vane that is substantially perpendicular to the screw vane and substantially perpendicular to the screw shaft.

Compared to the rear vanes, the ribs have more advantages in blocking the gas passages formed on the rear surface of the screw vanes because they allow the ribs to act as scrapers to rub non-combustible materials. This is because it comes into contact with the incombustible materials. Rubbed incombustibles serve to reliably fill the spaces provided on the rear face of the screw vanes. Thus, the ribs have greater advantages in blocking gas passages compared to the rear vanes which come in line contact with the non-combustible materials.

The ribs also wear in contact with the sands. Thus, the ideal shapes of the ribs are ultimately formed automatically by polishing. Once large ribs are provided, it is possible to maintain sealing performance and make the ribs ideally shaped.

However, if the heights of the ribs are increased to increase the sealing performance and the degree of contact between the ribs and the sand is increased, the rotation of the incombustibles with the screw vanes may be facilitated, or the load may be allowed by the motor. It may be possible to generate a trip in excess of the possible power. Therefore, it is necessary to form the ribs into suitable shapes as possible.

We have found that the optimum shape of the ribs can be determined based on the angle of inclination of the screw conveyor with respect to the horizontal plane and the angle of repose of the flow medium on the screw vanes. In particular, the basic shape of the rib is an equilateral triangle disposed substantially perpendicular to the screw shaft and the screw vane to block gas passages formed by the spaces on the rear face of the screw vane. The equilateral triangle has sides extending along the height of the screw vanes from the screw shaft. The angle formed by the screw vanes and the base of the triangle is preferably ((90-A) + B) °, where A is the inclination angle (°) of the screw conveyor with respect to the horizontal plane and B is the Angle of repose (°).

Of course, the present invention is not limited to the above examples. The length of the sides along the screw vanes may be adjusted to be longer or shorter than the height of the screw vanes in consideration of the properties of the object to be delivered. The rib may not be perpendicular to the screw vane or the screw shaft. The rib may be formed as a flat plate or a curved plate. If the object to be delivered mainly comprises a fluidized medium discharged from a fluidized bed combustor or fluidized-bed gasification furnace, the angle of repose B of the fluidized medium is within the range of 30 to 45 °, preferably within the range of 30 to 40 °, more Preferably it is within the range of 30-35 degrees.

In the example shown in FIG. 12, the screw shaft 451 of the screw conveyor 450a is inclined at 75 ° with respect to the horizontal plane, and the angle of repose of the object to be delivered is 30 °. Thus, each triangular rib 455 attached on the rear face of the screw vane 454 has a base angle of 45 ° (= 90 ° -75 ° + 30 °) relative to the screw vane 454.

The ribs 455 are preferably not provided around the screw shaft 451 at pitches of 180 ° or 360 °. If ribs 455 are provided around the screw shaft 451 at pitches of 180 ° or 360 °, the sealing effects of the ribs 455 are synchronized with the rotation of the screw shaft 451 to cause pulsation. ).

13 is a front view showing a screw conveyor 450b according to another embodiment of the present invention. The screw conveyor 450b has a rear vane 456 provided continuously on the rear face of the screw vane 454. The rear vane 456 has a base angle of 45 ° (= 90 ° -75 ° + 30 °) with respect to the screw vane 454, like the ribs 455 shown in FIG.

In addition to the rotational speed of the screw shaft, the inventors have found parameters that can control the amount of delivery in a screw conveyor having a screw shaft inclined at an increasing angle of at least 60 ° with respect to the horizontal plane. In general, screw conveyors are designed to reduce the polishing of members having a relative speed to an object higher than other members, ie the polishing of the tip portions of the screw vanes. Accordingly, the maximum delivery amount is automatically determined. In particular, if the rotational speed of the screw shaft or the diameter of the screw vanes is increased to increase the transfer capacity, the speeds of the tip portions of the screw vanes also increase proportionally. Accordingly, it is known that screw conveyors have a limited amount of delivery.

According to the experiments carried out by the inventors, the transfer efficiency of a screw conveyor with a screw shaft inclined at an increasing angle of at least 60 ° relative to the horizontal plane is greatly reduced to 30% or less of the horizontal screw conveyor. Thus, screw conveyors having screw shafts inclined at an enlarging angle of at least 60 ° require a device for increasing the transfer capacity. The inventors have devised that the delivery capacity of the screw conveyor can be increased by increasing the pressure of the portion disposed below the screw conveyor, i.e., upstream of the flow of the object.

As mentioned above, in order to increase the pressure at the bottom of the screw conveyor, a gas such as air may be blown into the screw conveyor. For example, in FIG. 3B, the fluidizing gas 331 may be blown into the fluid medium separation chamber 390 disposed upstream of the screw conveyor 378. By adjusting the amount of the fluidizing gas 331, the pressure at the bottom of the screw conveyor 378 can be adjusted. The fluidizing gas 331 may include an inert gas such as steam, nitrogen, carbon dioxide, oxygen, or a mixture thereof. Since the pressure of the lower portion of the screw conveyor 378 changes in proportion to the amount of the fluidizing gas 331 to be blown, the adjustment of the pressure can be easily performed.

In experiments using air as the gas to be blown, the inventors have found that the delivery capacity is increased more than twice as much as without using the gas to be blown. The experimental results show that it is possible to design a screw conveyor with a limited peripheral speed of the tip of the screw vanes to prevent grinding in a fairly wide range.

While certain preferred embodiments of the present invention have been shown and described in detail, it is evident that various modifications and variations of the present invention are possible without departing from the scope of the appended claims.

The present invention relates to solid wastes containing non-combustible materials or wastes such as municipal waste, solid fuel (RDF) using solid waste, waste plastic, waste fiber reinforced plastic (waste FRP), biomass waste, waste vehicle residue (ASR) and waste oil. It is suitable for use in a nonflammable material retirement system for retiring nonflammable materials with a fluidized medium exiting a fluidized bed furnace for combustion, vaporization or pyrolysis of solid combustible materials such as fuel (eg coal).

Claims (36)

In the non-combustible material withdrawal system for the removal of the non-combustible material from the fluidized bed furnace in which the fluidized bed is formed by the fluid medium, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Placed downstream of the mixture delivery furnace to fluidize the mixture with a fluidizing gas and separate the mixture into a separate first mixture having a high concentration of fluidized medium and a separate second mixture having a high concentration of the incombustibles. Fluidized bed separation chamber; A conveying passage for conveying the separated first mixture to the fluidized bed furnace; And Incombustibles discharging passage for discharging the separated second mixture to the outside of the fluidized bed Non-combustible material eviction system comprising a. The method of claim 1, And the incombustibles discharging passage is disposed downstream of the fluidized bed separation chamber. The method of claim 2, The non-combustible material discharge passage delivers the separated second mixture upwardly in a vertical direction, and discharges the separated second mixture to the outside of the fluidized bed from a position located higher than the surface of the fluidized bed. Eviction system. The method of claim 3, Fluidized medium delivery device for delivering the separated second mixture in the vertical direction in the incombustible material discharge passage Non-combustible material eviction system, characterized in that it further comprises. The method of claim 3, Fluid delivery device for delivering the separated second mixture in the incombustibles discharge passage with a minimum Angle of Repose of the fluid relative to a horizontal plane Non-combustible material eviction system, characterized in that it further comprises. The method of claim 1, The fluidized bed separation chamber includes a passage portion connected to the incombustibles discharge passage, And wherein said passage portion includes short areas that are progressively increased toward said nonflammable discharge passage and a bottom surface inclined downward relative to said nonflammable discharge passage. In the non-combustible material withdrawal system for the removal of the non-combustible material from the fluidized bed furnace in which the fluidized bed is formed by the fluid medium, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; And A non-combustible discharge passage disposed downstream of the mixture delivery path for delivering the mixture upwardly in a vertical direction and for discharging the mixture out of the fluidized bed from a position located above the surface of the fluidized bed. Non-combustible material eviction system comprising a. The method of claim 7, wherein Fluidized medium delivery device for delivering the mixture in the vertical direction in the incombustibles discharge passage Non-combustible material eviction system, characterized in that it further comprises. The method of claim 7, wherein Fluid delivery device for delivering the mixture in the incombustibles discharge passage with a minimum Angle of Repose of the fluid relative to a horizontal plane Non-combustible material eviction system, characterized in that it further comprises. The method of claim 9, And the incombustibles discharging passage is arranged such that a small clearance is created between an inner side surface of the incombustibles discharging passage and the fluid medium delivery device. The method of claim 10, The clearance (Clearance) is in the range of 5 mm to 75 mm in the non-combustible material eviction system, characterized in that. In the non-combustible material withdrawal system for the removal of the non-combustible material from the fluidized bed furnace in which the fluidized bed is formed by the fluid medium, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Incombustibles discharging passages disposed downstream of the mixture delivery passage; A fluid medium delivery device for delivering the mixture outward to the fluidized bed in a vertical direction in the incombustibles discharge passage; And Projections projecting radially inward from the inner surface of the incombustible discharge passage Non-combustible material eviction system comprising a. The method of claim 12, And the protrusion is arranged to form a clearance of at least 20 mm between the protrusion and the fluid delivery device. In the non-combustible material withdrawal system for the removal of the non-combustible material from the fluidized bed furnace in which the fluidized bed is formed by the fluid medium, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Incombustibles discharging passages disposed downstream of the mixture delivery passage; And A screw conveyor having a screw vane for delivering the mixture out of the fluidized bed upwardly in a vertical direction in the incombustibles discharging passage; And the screw conveyor comprises a blocking member provided on the rear face of the screw vane. The method of claim 14, And said barrier member comprises a rear vane continuously provided on said rear face of said screw vane. The method of claim 14, And the blocking member includes a plurality of ribs attached on the rear surface of the screw vane. The method of claim 14, And the obstruction member has an angle of (90-A + B) with respect to the screw vane, wherein A is the inclination angle of the screw conveyor and B is the angle of repose of the mixture. In the non-combustible material withdrawal system for the removal of the non-combustible material from the fluidized bed furnace in which the fluidized bed is formed by the fluid medium, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Incombustibles discharging passages disposed downstream of the mixture delivery passage; A fluid medium delivery device for delivering the mixture outward to the fluidized bed in a vertical direction in the incombustibles discharge passage; And Blowing device for blowing gas into the lower portion of the fluid medium delivery device to increase the pressure of the lower portion of the fluid medium delivery device Non-combustible material eviction system comprising a. In a fluidized bed furnace system, A fluidized bed in which a fluidized bed is formed therein by the fluidized medium to burn, vaporize, or pyrolyze an object containing a non-combustible material; And Including non-combustible material removal systems, The non-combustible material eviction system, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Fluidized by a fluidizing gas and disposed downstream of the mixture delivery furnace to separate the mixture into a separate first mixture having a high concentration of fluidized medium and a separate second mixture having a high concentration of incombustibles. Fluidized bed separation chamber; A conveying passage for conveying the separated first mixture to the fluidized bed furnace; And And a non-combustible discharge passage for discharging said separated second mixture to the outside of said fluidized bed. The method of claim 19, And wherein the incombustibles discharging passage is disposed downstream of the fluidized bed separation chamber. The method of claim 20, The incombustible discharge passage delivers the separated second mixture upwardly in a vertical direction, and discharges the separated second mixture to the outside of the fluidized bed from a position located higher than the surface of the fluidized bed. system. The method of claim 21, Fluidized medium delivery device for delivering the separated second mixture in the vertical direction in the incombustible material discharge passage Fluidized bed furnace system characterized in that it further comprises. The method of claim 21, Fluid delivery device for delivering the separated second mixture in the incombustibles discharge passage at the minimum angle of repose of the fluid to a horizontal plane Fluidized bed furnace system characterized in that it further comprises. The method of claim 19, The fluidized bed separation chamber includes a passage portion connected to the incombustibles discharge passage, Wherein said passage portion includes stepped areas that gradually increase toward said incombustibles discharging passage and a bottom surface inclined downward with respect to said incombustibles discharging passage. In a fluidized bed furnace system, A fluidized bed in which a fluidized bed is formed therein by the fluidized medium to burn, vaporize, or pyrolyze an object containing a non-combustible material; And A non-combustible material eviction system, The non-combustible material eviction system, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; And And a non-combustible discharge passage disposed downstream of the mixture delivery path for delivering the mixture upwardly in a vertical direction and for discharging the mixture out of the fluidized bed from a position located above the surface of the fluidized bed. Fluidized bed furnace system. The method of claim 25, Fluidized medium delivery device for delivering the mixture in the vertical direction in the incombustibles discharge passage Fluidized bed furnace system characterized in that it further comprises. The method of claim 25, Fluid delivery system for delivering the mixture in the incombustibles discharge passage at a minimum angle of repose of the fluid relative to a horizontal plane Fluidized bed furnace system characterized in that it further comprises. The method of claim 27, And the incombustibles discharging passage is arranged such that a small clearance is created between the fluid carrier and the inner surface of the incombustibles discharging passage. The method of claim 28, The clearance is in the range of about 5 mm to about 75 mm. In a fluidized bed furnace system, A fluidized bed in which a fluidized bed is formed therein by the fluidized medium to burn, vaporize, or pyrolyze an object containing a non-combustible material; And A non-combustible material eviction system, The non-combustible material eviction system, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Incombustibles discharging passages disposed downstream of the mixture delivery passage; A fluid medium delivery device for delivering the mixture outward to the fluidized bed in a vertical direction in the incombustibles discharge passage; And A projection protruding radially inwardly from an inner surface of said incombustibles discharging passageway. The method of claim 30, And the protrusion is arranged to form a clearance of at least 20 mm between the protrusion and the fluid delivery device. In a fluidized bed furnace system, A fluidized bed in which a fluidized bed is formed therein by the fluidized medium to burn, vaporize, or pyrolyze an object containing a non-combustible material; And A non-combustible material eviction system, The non-combustible material eviction system, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Incombustibles discharging passages disposed downstream of the mixture delivery passage; And A screw conveyor having a screw vane for transferring the mixture out of the fluidized bed upwardly in a vertical direction in the incombustibles discharging passage, wherein the screw conveyor is located after the screw vane. And a blocking member provided on the side. 33. The method of claim 32, And said blocking member comprises a rear vane continuously provided on said rear face of said screw vane. 33. The method of claim 32, And said blocking member comprises a plurality of ribs attached on said rear surface of said screw vane. 33. The method of claim 32, Said blocking member having an angle of (90-A + B) with respect to said screw vane, wherein A is the inclination angle of said screw conveyor and B is the angle of repose of said mixture. In a fluidized bed furnace system, A fluidized bed in which a fluidized bed is formed therein by the fluid medium to burn, vaporize, or pyrolyze an object containing incombustibles; And A non-combustible material eviction system, The non-combustible material eviction system, A mixture delivery furnace for delivering a mixture of the fluid medium and the incombustible material from the bottom of the fluidized bed; Incombustibles discharging passages disposed downstream of the mixture delivery passage; A fluid medium delivery device for delivering the mixture outward to the fluidized bed in a vertical direction in the incombustibles discharge passage; And Blowing device for blowing gas into the lower portion of the fluid medium delivery device to increase the pressure of the lower portion of the fluid medium delivery device Fluidized bed furnace system comprising a.

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